// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/devtools/devtools_http_handler.h"

#include <stdint.h>

#include <memory>
#include <utility>

#include "base/files/file_util.h"
#include "base/files/scoped_temp_dir.h"
#include "base/location.h"
#include "base/memory/ptr_util.h"
#include "base/run_loop.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string_number_conversions.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/values.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/devtools_manager_delegate.h"
#include "content/public/browser/devtools_socket_factory.h"
#include "content/public/test/test_browser_thread_bundle.h"
#include "content/public/test/test_utils.h"
#include "net/base/ip_address.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_errors.h"
#include "net/socket/server_socket.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace content {
namespace {

    const uint16_t kDummyPort = 4321;
    const base::FilePath::CharType kDevToolsActivePortFileName[] = FILE_PATH_LITERAL("DevToolsActivePort");

    class DummyServerSocket : public net::ServerSocket {
    public:
        DummyServerSocket() { }

        // net::ServerSocket "implementation"
        int Listen(const net::IPEndPoint& address, int backlog) override
        {
            return net::OK;
        }

        int GetLocalAddress(net::IPEndPoint* address) const override
        {
            *address = net::IPEndPoint(net::IPAddress::IPv4Localhost(), kDummyPort);
            return net::OK;
        }

        int Accept(std::unique_ptr<net::StreamSocket>* socket,
            const net::CompletionCallback& callback) override
        {
            return net::ERR_IO_PENDING;
        }
    };

    void QuitFromHandlerThread(const base::Closure& quit_closure)
    {
        BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, quit_closure);
    }

    class DummyServerSocketFactory : public DevToolsSocketFactory {
    public:
        DummyServerSocketFactory(base::Closure quit_closure_1,
            base::Closure quit_closure_2)
            : quit_closure_1_(quit_closure_1)
            , quit_closure_2_(quit_closure_2)
        {
        }

        ~DummyServerSocketFactory() override
        {
            BrowserThread::PostTask(
                BrowserThread::UI, FROM_HERE, quit_closure_2_);
        }

    protected:
        std::unique_ptr<net::ServerSocket> CreateForHttpServer() override
        {
            base::ThreadTaskRunnerHandle::Get()->PostTask(
                FROM_HERE, base::Bind(&QuitFromHandlerThread, quit_closure_1_));
            return base::WrapUnique(new DummyServerSocket());
        }

        std::unique_ptr<net::ServerSocket> CreateForTethering(
            std::string* out_name) override
        {
            return nullptr;
        }

        base::Closure quit_closure_1_;
        base::Closure quit_closure_2_;
    };

    class FailingServerSocketFactory : public DummyServerSocketFactory {
    public:
        FailingServerSocketFactory(const base::Closure& quit_closure_1,
            const base::Closure& quit_closure_2)
            : DummyServerSocketFactory(quit_closure_1, quit_closure_2)
        {
        }

    private:
        std::unique_ptr<net::ServerSocket> CreateForHttpServer() override
        {
            base::ThreadTaskRunnerHandle::Get()->PostTask(
                FROM_HERE, base::Bind(&QuitFromHandlerThread, quit_closure_1_));
            return nullptr;
        }
    };

    class BrowserClient : public ContentBrowserClient {
    public:
        BrowserClient() { }
        ~BrowserClient() override { }
        DevToolsManagerDelegate* GetDevToolsManagerDelegate() override
        {
            return new DevToolsManagerDelegate();
        }
    };

}

class DevToolsHttpHandlerTest : public testing::Test {
public:
    DevToolsHttpHandlerTest()
        : testing::Test()
    {
    }

    void SetUp() override
    {
        content_client_.reset(new ContentClient());
        browser_content_client_.reset(new BrowserClient());
        SetBrowserClientForTesting(browser_content_client_.get());
    }

private:
    std::unique_ptr<ContentClient> content_client_;
    std::unique_ptr<ContentBrowserClient> browser_content_client_;
    content::TestBrowserThreadBundle thread_bundle_;
};

TEST_F(DevToolsHttpHandlerTest, TestStartStop)
{
    base::RunLoop run_loop, run_loop_2;
    std::unique_ptr<DevToolsSocketFactory> factory(
        new DummyServerSocketFactory(run_loop.QuitClosure(),
            run_loop_2.QuitClosure()));
    DevToolsAgentHost::StartRemoteDebuggingServer(
        std::move(factory), std::string(), base::FilePath(), base::FilePath(),
        std::string(), std::string());
    // Our dummy socket factory will post a quit message once the server will
    // become ready.
    run_loop.Run();
    DevToolsAgentHost::StopRemoteDebuggingServer();
    // Make sure the handler actually stops.
    run_loop_2.Run();
}

TEST_F(DevToolsHttpHandlerTest, TestServerSocketFailed)
{
    base::RunLoop run_loop, run_loop_2;
    std::unique_ptr<DevToolsSocketFactory> factory(
        new FailingServerSocketFactory(run_loop.QuitClosure(),
            run_loop_2.QuitClosure()));
    DevToolsAgentHost::StartRemoteDebuggingServer(
        std::move(factory), std::string(), base::FilePath(), base::FilePath(),
        std::string(), std::string());
    // Our dummy socket factory will post a quit message once the server will
    // become ready.
    run_loop.Run();
    for (int i = 0; i < 5; i++) {
        RunAllPendingInMessageLoop(BrowserThread::UI);
        RunAllPendingInMessageLoop(BrowserThread::FILE);
    }
    DevToolsAgentHost::StopRemoteDebuggingServer();
    // Make sure the handler actually stops.
    run_loop_2.Run();
}

TEST_F(DevToolsHttpHandlerTest, TestDevToolsActivePort)
{
    base::RunLoop run_loop, run_loop_2;
    base::ScopedTempDir temp_dir;
    EXPECT_TRUE(temp_dir.CreateUniqueTempDir());
    std::unique_ptr<DevToolsSocketFactory> factory(
        new DummyServerSocketFactory(run_loop.QuitClosure(),
            run_loop_2.QuitClosure()));

    DevToolsAgentHost::StartRemoteDebuggingServer(
        std::move(factory), std::string(), temp_dir.GetPath(), base::FilePath(),
        std::string(), std::string());
    // Our dummy socket factory will post a quit message once the server will
    // become ready.
    run_loop.Run();
    DevToolsAgentHost::StopRemoteDebuggingServer();
    // Make sure the handler actually stops.
    run_loop_2.Run();

    // Now make sure the DevToolsActivePort was written into the
    // temporary directory and its contents are as expected.
    base::FilePath active_port_file = temp_dir.GetPath().Append(kDevToolsActivePortFileName);
    EXPECT_TRUE(base::PathExists(active_port_file));
    std::string file_contents;
    EXPECT_TRUE(base::ReadFileToString(active_port_file, &file_contents));
    int port = 0;
    EXPECT_TRUE(base::StringToInt(file_contents, &port));
    EXPECT_EQ(static_cast<int>(kDummyPort), port);
}

} // namespace content
